Back-rest for lathes.



Patented September 20, 1904.

PATENT OFFICE.

NATHAN LENTZ, OF DES MOINES, IOWA.

BACK-REST FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 770,724, dated September 20, 1904.

Application filed December 11, 1903. Serial No- 184348. (No model.)

1'0 all wltom it may concern.-

Be it known that I, NATHAN LENTZ, acitizen of the United States of America, and a resident of Des Moines, Polk county, Iowa, have invented a new and useful Back -Rest for Lathes, of which the following is a specifica- 'tion.

The object of this invention is to provide improved means for supporting, steadying,

and backing a spindle or baluster on a turninglathe whereby the stick being turned is held against flexure during the operation of turning.

A further object of this invention is to be found in the provision of a back-rest or steadying-rest for Wood-turning lathes adjustable to sticks of various diameters and adjustable to lathe-heads of varying heights.

A further object of this invention is to be found in the provision of means for conveniently and expeditiously locking and unlocking a back-rest for adjustment to various angles in respect of the bed of a lathe. My invention consists in the construction, arrangement, and combination of elements hereinafter set forth, pointed out in my claims, and illustrated by the accompanying drawings. in which- Figure 1 is a side elevation illustrating the application and use of my improved device. Fig. 2 is a rear elevation of the same. Fig. 3 is a detail cross-sectionshowing the means employed to lock the back-rest in either of various angles relative to the bed of the lathe. Fig. 4 is a face view of a lever opposite to that shown in Fig. 1. Fig. 5 is a side elevation of a portion of my device detached from the remainder.

In the construction of the device as shown the numeral designates a lever formed with a bore in one end portion to receive a fulcrumbolt 11, which fulcrum-bolt is mounted for oscillation in a block 12. The block 12 is mounted transversely of and upon the shears 13 of a lathe-frame and is bolted to another block 14: beneath and transversely of said shears by a bolt 15. The bolt 15 is mounted through coinciding apertures in the blocks 12 1A and extends through the space between the shears 13. A hand-wheel or wheel-nut 16 is screwed rounding the bore therein, and said boss isformed with an angular cavity arranged to receive a head 18 of the fulcrum-bolt 11, whereby in an oscillation of the lever 10 the bolt 11 also will be oscillated, and when said lever is stationary it will hold said bolt against rotation. That end portion of the bolt 11 opposite the head 18 is threaded, and a handlenut 19 is screwed thereon and engages that face of the block 12 opposite to the lever 10.

.The handle-nut 19 is formed as a lever, with a thickened end portion formed with a thread ed aperture arranged for engagement with the threaded end portion of the bolt 11. The lever 10 and handle-nut 19 preferably occupy upright positions, either vertical or inclined slightly from the vertical in either direction. A slot 20 is formed in and longitudinally of the lever 10, and ribs 21 22 are formed on one face of said lever adjacent to and parallel with said slot. A machine bolt 23 is mounted through the slot 20 and seated with its head in the space between and in contact with the ribs 21 22, said ribs serving to prevent the bolt from rotating.

A back-rest is provided and formed of a disk or plate 24:, having an aperture in its center to receive the bolt 23. A wheel-nut 25 is mounted on that end portion of the machine-bolt opposite to its head and outside the rest or plate 2 1 and serves to bind said plate to the lever 10. The bolt 23 may be adjusted longitudinally of the slot 20 to raise or lower the rest or plate 2 1 relative to the work being treated on the lathe and to adjust the device for use on lathe-heads of varying heights. The plate or disk 24 is formed with a pluralcry, which notches are of varying diameters IOO,

to fit work of varying sizes being turned on the lathe. In Fig. 1 of the drawings 1 show one of the notches 26 of the plate or disk 24 in contact with a spindle, pimple, or baluster 27 in the position required for practical use in resisting fiexure of the work being treated otherwise due to the application thereto of a turning-tool applied to the front of the work. In Fig. 5 I show a plate or disk 24, having a plurality of semicircular notches 26 in its periphery, which notches are of various sizes and differ in size from those shown in Fig. 1. Ijillustrate the two plates or disks 24 24 merely to show a variety of sizes of supporting or backing notches of semicircular form arranged to receive, bear upon, and support the work being turned on thelathe, since I do not desire to be limited to any particular size or number of supporting-notches in the disks or plates.

Referring to the device as illustrated in-Fig. 1, a movement of the handle-nut 19 inthe directionof the arrow at in Fig. 1 will slacken the tension on the-fulcrum-bolt 11 and permit the lever 10 to be moved in the direction of the" arrow 6 and away from the stick 27. Thereupon the disk 24 may be loosened by backward rotation-of the wheel-nut'25on the bolt 23 and may be adjusted"circumferentially to bring a notch of different size into contact with the work being treated or may be adjusted lengthwise of the lever 10 for another purpose. When not in use, the lever 10'would occupy a-position similar to that shown'as occupied by the handle-nut 19 and out of the way of the work being turned on the lathe; In-either position the lever 10 would be locked by tightening of the handle-nut 19on the fulcrum-bolt 11.

I do'not wishto'be limited to any particular form or construction of the lever 10 and means-employed to'connect the disk or plate 24: thereto,- since various devices may be adapted to this purpose without departing from the scope of my production:

I claim asmy invention' 1. In a back-rest for lathes,-the combination v of a support, a lever mounted for oscillatory adjustment thereon, a disk formed with a plurality of notches in its periphery and mounted for adjustment on said lever, and means for locking said lever.

2. In a back-rest for lathes, the combination of a suitable support adjustably mounted on a lathe-bed, a bolt on said support, a lever mounted on said bolt and arranged for oscillation' therewith on said support, a handle-nut on said bolt and arranged to lock said bolt and lever to the support, and a notched disk adjustably mounted on said lever.

3. In a back-rest for lathes, the combination of a suitable support, a lever mounted for oscillation thereon, means for locking said lever, a disk formed with notches in its periphery and adjustably mounted on said lever,whereby one of thenotches may be brought into contact with the upper portion of a stick being turned, and means for locking said disk to said lever.

1. In a back-rest for lathes, the'combination of a suitable supportg-a lever mounted foroscillation thereon, means for locking'saidlever, a diskformed with notches in its periphery and mounted for adjustment longitudinally of said lever, whereby one of the notches may be brought into contact with the upper portion of a stick being turned,- said disk also mounted for circumferential adjustment, and

means for locking said diskto said lever.-

5. In a back-rest for lathes, the'combination of a support, a bolt mounted loosely in said support. a lever non-rotatably connected to said bolt, a handle-nut on said bolt and arranged to'lock said bolt and lever against oscillation, and'a disk mounted for'circumferential' adjustment andalso for adjustment longitudinally of said lever, saiddisk-formed'with notches in' itsperiphery.

Signed by me: at Des Moines, Iowa,this 27th day of October, 1903. x

NATHAN LENIZL Witnesses:

S. (1. SWEET, W. E. Ennis. 

